Angular Correlations of Coincident Electron-Positron Pairs Produced in Heavy-Ions Colllisions with Nuclear Time Delay

摘要

We investigate angular correlations between coincident electron-positron pairs emitted in heavy ion collisions with nuclear time delay. Special attention is directed to a comparison of supercritical and subcritical systems, where angular correlations of pairs produced in collisions of bare U-nuclei are found to alter their sign for nuclear delay times of the order of 2x10/sup -21/ s. This effect is shown to occur exclusively in supercritical systems, where spontaneous positron creation is active. (ERA citation 13:045929)